<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script>
window.onload=function()
{
	var oBtn=document.getElementById('btn1');
	//attachEvent  IE10版本以下使用  加onclick
	oBtn.addEventListener('click',function(){  //IE10以及谷歌等浏览器
		alert('a');
	},false);
};
</script>
</head>

<body>
<input id="btn1" type="button" value="按钮" />
</body>
</html>
